<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    body {
      margin: 40px;
    }

    .header {
      grid-area: header;
    }

    .sidebar {
      grid-area: sidebar;
    }

    .content {
      grid-area: content;
      position: relative;
    }

    .footer {
      grid-area: footer;
    }

    .wrapper {
      display: grid;
      grid-gap: 10px;
      grid-template-columns: 200px 200px 200px;
      grid-template-areas:
        "header  header  header"
        "sidebar content content"
        "footer  footer  footer";
      background-color: #fff;
      color: #444;
    }

    .box {
      background-color: #444;
      color: #fff;
      border-radius: 5px;
      padding: 50px;
      font-size: 150%;
    }

    .header,
    .footer {
      background-color: #999;
    }

    .topleft {
      position: absolute;
      top: 0;
      left: 0;
    }

    .topright {
      position: absolute;
      top: 0;
      right: 0;
    }

    .bottomleft {
      position: absolute;
      bottom: 0;
      left: 0;
    }

    .bottomright {
      position: absolute;
      bottom: 0;
      right: 0;
    }
  </style>
</head>

<body>
  <div class="wrapper">
    <div class="box header">Header</div>
    <div class="box sidebar">Sidebar</div>
    <div class="box content">Content
      <br /> The four arrows are inline images inside the content area.
      <img src="http://gridbyexample.com/examples/code/arrow-top-left.png" alt="top left" class="topleft" />
      <img src="http://gridbyexample.com/examples/code/arrow-top-right.png" alt="top right" class="topright" />
      <img src="http://gridbyexample.com/examples/code/arrow-bottom-left.png" alt="bottom left" class="bottomleft" />
      <img src="http://gridbyexample.com/examples/code/arrow-bottom-right.png" alt="bottom right" class="bottomright" />
    </div>
    <div class="box footer">Footer</div>
  </div>
</body>

</html>
